Switch from the chrome api to the browser api so this code is easier to port to any compliant browsers

[MarkIannucci]

Is your feature request related to a problem? Please describe.
It looks like the only way to get this code to port to Firefox is to use web-ext which needs to pack the extension. It looks like web-ext is only compliant with the browser namespace.

Describe the solution you'd like
Switch the chrome. references to browser. references and confirm it works in chrome; from there, see if it works in firefox, then check it out in Edge

[MarkIannucci]

This is related to #25